Gene mapping via bulked segregant RNA-Seq (BSR-Seq).

PloS One
Sanzhen LiuPatrick S Schnable

Abstract

Bulked segregant analysis (BSA) is an efficient method to rapidly and efficiently map genes responsible for mutant phenotypes. BSA requires access to quantitative genetic markers that are polymorphic in the mapping population. We have developed a modification of BSA (BSR-Seq) that makes use of RNA-Seq reads to efficiently map genes even in populations for which no polymorphic markers have been previously identified. Because of the digital nature of next-generation sequencing (NGS) data, it is possible to conduct de novo SNP discovery and quantitatively genotype BSA samples by analyzing the same RNA-Seq data using an empirical Bayesian approach. In addition, analysis of the RNA-Seq data provides information on the effects of the mutant on global patterns of gene expression at no extra cost. In combination these results greatly simplify gene cloning experiments. To demonstrate the utility of this strategy BSR-Seq was used to clone the glossy3 (gl3) gene of maize. Mutants of the glossy loci exhibit altered accumulation of epicuticular waxes on juvenile leaves. By subjecting the reference allele of gl3 to BSR-Seq, we were able to map the gl3 locus to an ≈ 2 Mb interval. The single gene located in the ≈ 2 Mb mapping interval whose e...Continue Reading

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Datasets Mentioned

BETA
X86563.2

Methods Mentioned

BETA
PCR
RNA-Seq
BSR-Seq

Software Mentioned

BLAST
GSNAP
Seq
BSR
GSNAP ( Genomic Short - read Nucleotide Alignment Program
MapMan

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